3.1.3 \(\int \frac {1}{x \sqrt {1+x^8}} \, dx\) [3]

Optimal. Leaf size=14 \[ -\frac {1}{4} \tanh ^{-1}\left (\sqrt {1+x^8}\right ) \]

[Out]

-1/4*arctanh((x^8+1)^(1/2))

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Rubi [A]
time = 0.00, antiderivative size = 14, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, integrand size = 13, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.231, Rules used = {272, 65, 213} \begin {gather*} -\frac {1}{4} \tanh ^{-1}\left (\sqrt {x^8+1}\right ) \end {gather*}

Antiderivative was successfully verified.

[In]

Int[1/(x*Sqrt[1 + x^8]),x]

[Out]

-1/4*ArcTanh[Sqrt[1 + x^8]]

Rule 65

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> With[{p = Denominator[m]}, Dist[p/b, Sub
st[Int[x^(p*(m + 1) - 1)*(c - a*(d/b) + d*(x^p/b))^n, x], x, (a + b*x)^(1/p)], x]] /; FreeQ[{a, b, c, d}, x] &
& NeQ[b*c - a*d, 0] && LtQ[-1, m, 0] && LeQ[-1, n, 0] && LeQ[Denominator[n], Denominator[m]] && IntLinearQ[a,
b, c, d, m, n, x]

Rule 213

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(-(Rt[-a, 2]*Rt[b, 2])^(-1))*ArcTanh[Rt[b, 2]*(x/Rt[-a, 2])]
, x] /; FreeQ[{a, b}, x] && NegQ[a/b] && (LtQ[a, 0] || GtQ[b, 0])

Rule 272

Int[(x_)^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Dist[1/n, Subst[Int[x^(Simplify[(m + 1)/n] - 1)*(a
+ b*x)^p, x], x, x^n], x] /; FreeQ[{a, b, m, n, p}, x] && IntegerQ[Simplify[(m + 1)/n]]

Rubi steps

\begin {align*} \int \frac {1}{x \sqrt {1+x^8}} \, dx &=\frac {1}{8} \text {Subst}\left (\int \frac {1}{x \sqrt {1+x}} \, dx,x,x^8\right )\\ &=\frac {1}{4} \text {Subst}\left (\int \frac {1}{-1+x^2} \, dx,x,\sqrt {1+x^8}\right )\\ &=-\frac {1}{4} \tanh ^{-1}\left (\sqrt {1+x^8}\right )\\ \end {align*}

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Mathematica [A]
time = 0.01, size = 14, normalized size = 1.00 \begin {gather*} -\frac {1}{4} \tanh ^{-1}\left (\sqrt {1+x^8}\right ) \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[1/(x*Sqrt[1 + x^8]),x]

[Out]

-1/4*ArcTanh[Sqrt[1 + x^8]]

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Mathics [A]
time = 1.95, size = 6, normalized size = 0.43 \begin {gather*} -\frac {\text {ArcSinh}\left [\frac {1}{x^4}\right ]}{4} \end {gather*}

Warning: Unable to verify antiderivative.

[In]

mathics('Integrate[Sqrt[x^8 + 1]/(x*(x^8 + 1)),x]')

[Out]

-ArcSinh[1 / x ^ 4] / 4

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Maple [A]
time = 0.14, size = 19, normalized size = 1.36

method	result	size
trager	\(\frac {\ln \left (\frac {\sqrt {x^{8}+1}-1}{x^{4}}\right )}{4}\)	\(17\)
default	\(\frac {\ln \left (\frac {\sqrt {x^{8}+1}-1}{\sqrt {x^{8}}}\right )}{4}\)	\(19\)
meijerg	\(\frac {\left (-2 \ln \left (2\right )+8 \ln \left (x \right )\right ) \sqrt {\pi }-2 \sqrt {\pi }\, \ln \left (\frac {1}{2}+\frac {\sqrt {x^{8}+1}}{2}\right )}{8 \sqrt {\pi }}\)	\(37\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(x^8+1)^(1/2)/x,x,method=_RETURNVERBOSE)

[Out]

1/4*ln(((x^8+1)^(1/2)-1)/(x^8)^(1/2))

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Maxima [B] Leaf count of result is larger than twice the leaf count of optimal. 25 vs. \(2 (10) = 20\).
time = 0.26, size = 25, normalized size = 1.79 \begin {gather*} -\frac {1}{8} \, \log \left (\sqrt {x^{8} + 1} + 1\right ) + \frac {1}{8} \, \log \left (\sqrt {x^{8} + 1} - 1\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(x^8+1)^(1/2)/x,x, algorithm="maxima")

[Out]

-1/8*log(sqrt(x^8 + 1) + 1) + 1/8*log(sqrt(x^8 + 1) - 1)

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Fricas [B] Leaf count of result is larger than twice the leaf count of optimal. 25 vs. \(2 (10) = 20\).
time = 0.33, size = 25, normalized size = 1.79 \begin {gather*} -\frac {1}{8} \, \log \left (\sqrt {x^{8} + 1} + 1\right ) + \frac {1}{8} \, \log \left (\sqrt {x^{8} + 1} - 1\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(x^8+1)^(1/2)/x,x, algorithm="fricas")

[Out]

-1/8*log(sqrt(x^8 + 1) + 1) + 1/8*log(sqrt(x^8 + 1) - 1)

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Sympy [A]
time = 0.42, size = 8, normalized size = 0.57 \begin {gather*} - \frac {\operatorname {asinh}{\left (\frac {1}{x^{4}} \right )}}{4} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(x**8+1)**(1/2)/x,x)

[Out]

-asinh(x**(-4))/4

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Giac [B] Leaf count of result is larger than twice the leaf count of optimal. 25 vs. \(2 (10) = 20\).
time = 0.00, size = 35, normalized size = 2.50 \begin {gather*} \frac {\frac {\ln \left (\sqrt {x^{8}+1}-1\right )}{2}-\frac {\ln \left (\sqrt {x^{8}+1}+1\right )}{2}}{4} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(x^8+1)^(1/2)/x,x)

[Out]

-1/8*log(sqrt(x^8 + 1) + 1) + 1/8*log(sqrt(x^8 + 1) - 1)

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Mupad [B]
time = 0.07, size = 10, normalized size = 0.71 \begin {gather*} -\frac {\mathrm {atanh}\left (\sqrt {x^8+1}\right )}{4} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(x*(x^8 + 1)^(1/2)),x)

[Out]

-atanh((x^8 + 1)^(1/2))/4

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